<link rel="stylesheet" href="./demo.css">
<!-- 进度条 -->
<div class="box1">
    <div class='box1-2'></div>
    <div>当前得分为：<span class="score">0</span></div>
</div>

<!-- 弹出游戏结束  -->
<div class="box2">游戏结束！<br> 总得分为:<span class="totalScore"></span></div>
<script src="./demo.js"></script> 
